MUSE...
to my eye it looks like SONAR (8.3) does support dragging and dropping of recorded audio
(through Tape It) into an audio track... works for me...
Rusty

ORIGINAL: ew

...Insert the synth as an effect on an audio track. Assign a MIDI track to the synth. Arm the audio track and go. Note that you'll have to mute any other audio tracks; otherwise you'll bleed into the recorded track.

ew

Thanks for the tip ew(nice hat!) and I'm familiar with adding Vsti's as an audio FX, e.g.-Amplitube. But this severely cripples a multitimbral synth such as RMX. Maybe Sonar 9?

Interesting. Either tapeIt uses a different method than Edison to do this or I need to try a different method. I was assuming it would create a track as it does in Reaper but did also try creating an empty track and that didn't work either so is there something else I need to do (e.g. does it need to actually have some audio in it already?)

regarding: "does it need to have some audio in it already?"
not with Tape It. when all recording has finished, you drag from
the Tape It icon within the Tape It window, plop it anywhere in the empty
audio track, voila. (The Tape It plug was inserted into the fx bin of the synth track).
I don't remember much about the difference in the feature set between
the free Tape It 1 and the $20 Tape It 2, but it definitely works that way in Tape It 2.
The Silverspike website has a comparison table, i think.
Also, Tape It 2 supports multiple instances, so although it might take closer to a minute
or so to set up multiple instances, name files, etc for a multitimbral synth, it may work.

I just looked at the silverspike site... scroll down to the bottom of the Tape It page,
there is a comparison of the two versions >>> for me, the Tape It 2 version was a no brainer because of drag & drop
and Especially because of time stamping.
R

I'll have to experiment some more with Edison. I also have it inserted in the fx bin (although you can also have it in the master bin to record the whole piece). TapeIt looks OK but the great thing about Edison it's its a fully functional audio editor as a VST with excellent timestretching and beat slicing and in Reaper at least it will retain any markers and slices made if you drag it onto a track (plus you can drag selections as well as whole clips) so if I could get that working in Sonar too it would be very cool.

There's also a program called "Virtual Audio Cable" that I have used for this purpose. It' would work like this:

1) Install Virtual Audio Cable (which gives you 250+ "virtual cable's")

2) Set the output of your synth track(s) to "Virtual Cable #"

3) Set an audio track(s) input to "Virtual Cable #" and Record.

If i remember correctly you won't lose any quality or incur any latency. It's also a good way to achieve re-wire-like results (from one program to another.) If you don't like VAC, there are other programs that work identically, some of which also have MIDI functionality as well (VAC might now too...it's been awhile since I've used it myself) but I don't recall their name's. A google search for "virtual audio cable" will bring up all sorts of good stuff.

Hope that helps you,
-Mike

EDIT:

to add URL:
Virtual Audio Cable and/or... Virtual Audio Cable
then there's also the free JACK

I know this is an old thread (very old) but was this feature ever implemented?  I'm using X1, and its not possible to record soft synth output live to an audio track (at least, if it it is I don't know how ...).    Is it possible in X1?  if not, then in X2?

Excuse me if I do not understand very well the problem (I 'm going to receive Sonar soon, so I'm not used to it) but you could normally have the possibility to record from any track (audio or midi) any performance you're playing (?) : first : arm the track (red button in the track) and second: to start recording, click the Record button in the transport module of the control bar (or press R)
And afterwards, for recording the actions on the different parameters available in the soft synth, does not the Write button in the synth rack  (no track but rack) settle the matter ? And with this write function, theorically, you can record  the modifications you made on the synth in real time (?)
But sorry if I have the wrong end of the stick

You should ask this question in the X1 forum.